In the dark cathedral, a mage harnesses the power of demons to strengthen her spells. In the alchemical laboratory, a diviner inscribes a scroll of destruction. Meanwhile, a bard and beastmaster look for the prismatic dragon and golden lion to keep these forces of darkness at bay.

Res Arcana: Lux and Tenebrae brings 4 new Places of Power, 12 artifacts, 4 mages, 4 monuments, and 2 magic items to Res Arcana. It also expands the game to 5 players, and adds scaling rules for fewer players. Plus it introduces two new things: scrolls and demons.